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Optimum Nutrition Gold Standard vs Dymatize ISO100 (2026)
Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
The Verdict
Optimum Nutrition Gold Standard edges Dymatize ISO100 on our rubric (91 vs 87 on our 0-100 execution score) and is the better value, at about $1.30 per serving versus ISO100's $1.45. ISO100's advantage is its fully hydrolyzed isolate, which absorbs fast and is gentler for lactose-sensitive users; Gold Standard is the versatile category benchmark. Both are Informed Choice certified. In our view, choose Gold Standard for the best all-around value, and ISO100 if you want a hydrolyzed isolate for lactose sensitivity or fast post-workout absorption.
Gold Standard 100% Whey
Optimum Nutrition
ISO100 Hydrolyzed Whey Protein Isolate
Dymatize
Head-to-Head Comparison
| Category | Gold Standard 100% Whey Optimum Nutrition | ISO100 Hydrolyzed Whey Protein Isolate Dymatize |
|---|---|---|
| Brand Score | 91/100Winner | 87/100 |
| Dosing & Form | 25/25Winner | 25/25 |
| Purity | 20/25 | 23/25Winner |
| Value | 23/25Winner | 16/25 |
| Transparency | 23/25Winner | 23/25 |
| Cost/Day | $1.30Winner | $1.45 |
| Dose/Serving | 24g | 25g |
| Form | Whey Protein Isolate (primary) / Whey Protein Concentrate / Whey Peptides blend | Hydrolyzed Whey Protein Isolate |
| Third-Party Tested | ✓ Yes | ✓ Yes |
| Proprietary Blend | No | No |
Why This Comparison Matters
Gold Standard 100% Whey and ISO100 are two of the best-selling whey proteins in the world, and this is one of the most-searched protein matchups. Gold Standard is a whey isolate-primary blend; ISO100 is a fully hydrolyzed whey isolate marketed for fast absorption and lactose sensitivity. Both carry Informed Choice certification for banned substances.
Both deliver a solid per-serving protein dose. ISO100's hydrolyzed isolate is easier on lactose-sensitive stomachs; Gold Standard's blend is the long-standing category benchmark at a lower cost.
We scored both on evidence, quality, cost per dose, and transparency.
Detailed Score Breakdown
Gold Standard 100% Whey
Optimum Nutrition
Whey protein isolate as primary ingredient, supported by the full body of protein supplementation research
Informed Choice certified, GMP facility; lists whey isolate as the first protein source followed by concentrate - the blend is slightly less pure than a strict 100% isolate, but isolate leads the formula
$0.90-$1.00/day at 25g protein - strong value for a certified product at this scale; one of the lowest cost-per-gram certified options on the market
Protein sources listed individually (whey isolate, whey concentrate, whey peptides), exact amounts per macro are disclosed; no proprietary blends on protein content
The world's best-selling whey protein for good reason - consistent quality, Informed Choice certified, and a fair price at full-size containers. Note that it is technically an isolate-led blend, not a pure isolate.
ISO100 Hydrolyzed Whey Protein Isolate
Dymatize
Hydrolyzed whey protein isolate - supported by protein synthesis research; hydrolysis provides marginally faster absorption, which is not a clinically meaningful advantage for most users
Informed Choice certified, GMP facility; one of the most consistently tested whey isolate products available at a non-premium price point
$1.45/day at 25g protein - above median for an Informed Choice certified isolate; the hydrolysis step adds production cost
100% hydrolyzed whey protein isolate as the sole protein source, exact macros disclosed, no proprietary blends; among the most transparent labels in this category
One of the few mainstream whey isolates that is both Informed Choice certified and uses 100% hydrolyzed isolate with no concentrate filler. The hydrolysis is a real processing distinction, even if the performance advantage over standard isolate is marginal.
How We Compared These Products
Every product in our database is scored on four equally-weighted pillars: dosing accuracy and form quality, purity verification (third-party testing), cost per clinically effective dose (not cost per pill), and label transparency. Each pillar is worth 25 points for a total of 100.
Cost per effective dose is calculated using the clinically studied dose from published research, not the manufacturer's suggested serving. If a product requires multiple servings to reach the dose used in clinical trials, that cost is reflected in the value score.
For a full explanation of our scoring methodology, see our methodology page. Prices were last checked on the dates listed for each product and may have changed.
Frequently Asked Questions
Is Optimum Nutrition Gold Standard or Dymatize ISO100 better?
Gold Standard scores higher on our rubric (91 vs 87 on our 0-100 execution score) and costs slightly less per serving (about $1.30 vs $1.45), which makes it our all-around value pick. ISO100's edge is its fully hydrolyzed whey isolate - faster absorbing and easier on lactose-sensitive stomachs. Both carry Informed Choice banned-substance certification. Choose Gold Standard for value and versatility, ISO100 for a hydrolyzed isolate.
Does hydrolyzed whey (ISO100) work better than a whey blend?
Not for muscle-building outcomes in most people. Hydrolyzed whey is pre-broken-down for faster absorption and can be gentler for lactose-sensitive users, but for total daily protein and muscle protein synthesis, a quality whey isolate blend like Gold Standard performs comparably. The hydrolyzed form is a real benefit if you have digestion issues with whey, not a general performance upgrade.
More Whey Protein Isolate Comparisons
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FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.